Improvement in ratchet-drills



UNITED STATES PATENT OFFICE.

HENRY SMITH, OF MERIDEN, CONNECTICUT, ASSIGNOR TO CHARLES PARKER, OF SAME PLACE.

IMPROVEMENT IN RATCHET-DRILLS.

Specification forming part of Letters Patent No. 156,602, dated November 3, 1874; application tiled October 15, 1874.

To all whom it mag/"concern:

Beit known that I, HENRY SMITH, of Meriden, in the county of New Haven and State ot' Connecticut, have invented a new Improvement in Ratchet-Drill; and I do lhereby declare the following, when taken in`connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exa-ct description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, side view; Fig. 2, vertical central section; Fig. 3, top view, the adjusting screwsleeve removed Figs. 4, 5, 6, 7, and 8, detached views.

This invention relates to an improvement in the device for drilling metals known as ratchet-drills 5 and the invention consists in the peculiar arrangement of parts and manner of hanging the pawls, as fully hereinafter described.

A is the head, into which the drill is set', and secured by jaws B B, or in other suitable manner. Above the head A is the adjustingscrew C and sleeve D, operated to feedthe drill in the usual manner. On the head A the lever E is hun g, so as to be turned freely thereon, the axis of the head being the axis of the lever. In the lever around the head a recess,

F, is formed, and in this sets a collar, G, splined or otherwise attached to the head A, as seen at a, Figs. 3 and 4. The under surface of the collar G is toothed radially, as seen in Figs. 4 and 5, and in the corresponding` or upper surface of the lever one or more pawls, d, are set in the following manner: The pawl d :is of segmental form, as seen in Fig. 8, co nstructed with a downward-projecting lug or flange, e, at one end. In the lever a recess, f, is formed corresponding to the pawl, and with a cavity, n, to receive the flange e; and beneath the pawl thus arranged a spring, s, is arranged, the tendency of 'which is to hold up the pawl, as seen in Fig. 7.

When the lever is turned backward, the pawl or pawls will pass over the teeth on the collai1 G, the spring s yielding to allow it so to do; but upon turning in the opposite direction the pawls will engage corresponding teeth on the collar G, and cause the head A and drill to be turned with it. Y

This Vconstruction enables the making ot' the head of less diameter than when the pawls a-ct upon the periphery; it also affords a-strong and lirm seat or bearing for the pawls, and incloses them so that any derangenient ofthe operative parts by outside influences is avoided.

I claim- The combination of the head A, toothed collar G, recessed lever E, and pawl or pawls d, constructed and operating substantially as described.

HENRY SMITH.

Witnesses:

JOSEPH H. BEGKETT, RALPH A. PALMER. 

